Ruler.



PATENTED JULY 21, 1903.

A. WILDMAN.-

RULER.

APPLIOATION FILED 001220, 1902.

No MODEL.

a1/mfom MN f pm N 1N.

UNITED STATES Patented July 21, 1903.

PATENT OFFICE.

ANDREW WILDMAN, OF CHICAGO, ILLINOISASSIGNOR OF ONE-HALF TO NORMAN L.HAYDEN, OF COLUMBUS, OHIO.

ARutas.

SPECIFICATION forming part of Letters Patent No. 734,149, dated July 21,1903.

Application led October 20, 1902. Serial No. 127,946. (No model.)

.To all whom, it may concern:

Be it known that I, ANDREW WILDMAN, a citizen of the United States ofAmerica, residing at Chicago, in the county of Cook and State ofIllinois, have invented certain new l and useful Improvements in Rules,of which -the line 2 2 of Fig. 1.

the following is a specification.

My invention relates to certain new and useful improvements in rules;and its object is to produce a device of this class which shall combinethe advantages of an ordinary pocketrule with certain of the advantagesof a miter-square.

To these and certain minor ends my invention consists in certain novelfeatures of construction clearly illustrated in the accompan yingdrawings and fully described in the following specification.

In the aforesaid drawings, Figure lis a plan of my improved rule. Fig. 2is a section in Fig. 3 is a perspective of a portion of the rule shownin the left-hand portion of Fig. l. Fig. 4 is a section in the line 4 4of Fig. 3. Fig. 5 is an end view of the rule looking in the direction ofthe arrowof Fig. l. Fig. 6isa view of the springdetent, and Fig. 7 is asection through a modiiied form of the rule.

Referring to the drawings, A A' A2 A3 are four portions of a rule hingedtogether by hinges a a. after the manner of an ordinary- -thereof isdeemed necessary. The portion A of the rule is cut away to form a recessB, in which lies an arm C, pivoted upon aset-screw c at one end of themember A. The arm C is exactly the breadth of the recess B, so that whenit is swung as far as possible toward the portion A of the rule it willoccupy the cut-out space beyond the shoulder and lie flush with theremainder of the surface of the member A.` The end of the arm C adjacentto the pivot is enlarged to form a circular portion C', which isprovidedl with a number of notches c. .AspringD is secured to the memberA, as shown in the drawings, and this spring is provided with a tooth ordetent d, which engages the notches c' of the head of the arm C. Thetooth d and the notches c are formed in such manner that when the arm Cis placed in position to bring the :tooth into engagement with any oneof the notches the arm will be held quite firmly in position. Thestrength of the spring is, however, such that a slight force willsuffice to move the arm. The notches are in practice so positioned onthe head of the arm C that the said arm canv be automatically lockedclosed or at an angle ofthirty, forty-live, sixty, or ninety degreeswith respect to the member A. In Fig. 1 the arm is shown set at an angleof thirty degrees.

The uses to which rules of this sort can be put are very numerous. Itcan be used as a T-square lor miter-square with great ease andeffectiveness and when closed occupies no more space than an ordinarypocket-rule.

The modified form of device shown in Fig. 7 is one wherein the arm Cswings into a lonf gitudinal slot in the member A. It of course'operates in substantially the same way as the 'arm in the form shown,and I consider this form to have most of the advantages of thevpreferred form.

I realize that considerable changes can be made in the device abovedescribed,and I do not, therefore, desire to limit myself to thespecific form shown.

I claim as new and desire to secure by Letters Patent- In a device ofthe class described, the combination with the members, A,A', A2, A3, andhinges, a', a, securing said members pivotally together to form a rule,of a recess, B, formed at one side of the member, A, an arm, C, pivotedat one end of the member, A, and adapted to swing over said recess andlie ush with the surface of said member, A, said arm being provided witha head, C', in the form of an arc of a circle and provided with aplurality of notches, c'., a spring, D, secured to said member, A," anda tooth, d, mounted upon said spring, D, and held thereby in yieldingengagement with said head, C, substantially as described.

In witness whereof I have signed the above application for LettersPatent, at Chicago, in

the county of Cook and State of Illinois,`this 15th day of'October, A.D, 1902.

ANDREW WILD MAN.

Witnesses:

RUSSELL WILES, CHAs. O. SHERVEY.

